That log file just shows a generic lockup, nothing actually usable for
diagnosis. Please collect a full backtrace - see
http://wiki.ubuntu.com/X/Backtracing for directions.
Offhand, maybe it's an ABI incompatibility - those proprietary
applications might need rebuilt against current X or something.
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/738526
Title:
Launching a Qt app crashes X with NVIDIA card even after fix for
650539
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